Results 61 to 70 of about 72,880 (178)

Zero-mode analysis of quantum statistical physics

, 2008
We present a unified formulation for quantum statistical physics based on the representation of the density matrix as a functional integral. We identify the stochastic variable of the effective statistical theory that we derive as a boundary ...
A. Bessa, A. Das, C. A. A. de Carvalho, C. Itzykson, E. S. Fraga, G. Parisi, H. Kleinert, J. I. Kapusta, J. O. Andersen, J. Zinn-Justin, L. N. Lipatov, L. N. Lipatov, M. Le Bellac, R. P. Feynman   +13 more
core   +1 more source

Stochastic Tunneling in de Sitter Spacetime

Universe
Tunneling processes in de Sitter spacetime are studied by using the stochastic approach. We evaluate the Martin–Siggia–Rose–Janssen–de Dominicis (MSRJD) functional integral by using the saddle-point approximation to obtain the tunneling rate.
Taiga Miyachi, Jiro Soda, Junsei Tokuda
doaj   +1 more source

Equilibrium fluctuations in maximally noisy extended quantum systems

SciPost Physics, 2019
We introduce and study a class of models of free fermions hopping between neighbouring sites with random Brownian amplitudes. These simple models describe stochastic, diffusive, quantum, unitary dynamics.
Michel Bauer, Denis Bernard, Tony Jin
doaj   +1 more source

On quantum and parallel transport in a Hilbert bundle over spacetime

, 1995
We study the Hilbert bundle description of stochastic quantum mechanics in curved spacetime developed by Prugove\v{c}ki, which gives a powerful new framework for exploring the quantum mechanical propagation of states in curved spacetime.
Ali T S, Choquet-Bruhat Y, Drechsler W, Drechsler W, Drechsler W, Drechsler W, Drechsler W, Drechsler W, Drechsler W, Drechsler W, Drechsler W, Ehlers J, Graudenz D, Husimi K, Kobayashi S, Kobayashi S, Philip A Tuckey, Prugovecki E, Prugovecki E, Prugovecki E, Prugovecki E, Prugovecki E, W Drechsler, Wald R M   +23 more
core   +1 more source

Directed-Loop Quantum Monte Carlo Method for Retarded Interactions

, 2017
The directed-loop quantum Monte Carlo method is generalized to the case of retarded interactions. Using the path integral, fermion-boson or spin-boson models are mapped to actions with retarded interactions by analytically integrating out the bosons ...
Assaad, Fakher F., Hohenadler, Martin, Weber, Manuel   +2 more
core   +1 more source

Extended Minimal Atomicity through Nondifferentiability: A Mathematical-Physical Approach

Advances in Mathematical Physics, 2019
The mathematical concept of minimal atomicity is extended to fractal minimal atomicity, based on the nondifferentiability of the motion curves of physical system entities on a fractal manifold.
Gabriel Gavriluţ, Alina Gavriluţ, Maricel Agop   +2 more
doaj   +1 more source

Quantum calcium-ion interactions with EEG

, 2019
Previous papers have developed a statistical mechanics of neocortical interactions (SMNI) fit to short-term memory and EEG data. Adaptive Simulated Annealing (ASA) has been developed to perform fits to such nonlinear stochastic systems.
Asher, Atiya, Conway, Ericsson, Giacosa, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Ingber, Jensen, Langouche, Nunez, Preskill, Schulman   +29 more
core   +1 more source

Non-Gaussian quantum steering produced by quasi-phase-matching third-harmonic generation

New Journal of Physics
With the rapid advancements in fields such as quantum entanglement distillation and quantum metrology, the limitations of Gaussian states in certain applications within quantum computing and information processing have come to the forefront.
S Q Ma, D Y Zhang, Y Zhao, Y B Yu, G R Jin, A X Chen   +5 more
doaj   +1 more source

Quantum fluctuation theorems and power measurements

New Journal of Physics, 2015
Work in the paradigm of the quantum fluctuation theorems of Crooks and Jarzynski is determined by projective measurements of energy at the beginning and end of the force protocol.
B Prasanna Venkatesh, Gentaro Watanabe, Peter Talkner   +2 more
doaj   +1 more source

Stochastic Quantization for Complex Actions

, 2008
We use the stochastic quantization method to study systems with complex valued path integral weights. We assume a Langevin equation with a memory kernel and Einstein's relations with colored noise.
Menezes, G., Svaiter, N. F.
core   +1 more source